--- title: Palo Alto’s GlobalProtect Authentication Bypass Was... description: CVE-2026-0257, a GlobalProtect authentication bypass flaw, was exploited in the wild just four days after public disclosure. The vulnerability stems from a... canonical: https://daily.dev/posts/palo-alto-s-globalprotect-authentication-bypass-was-exploited-four-days-after-disclosure-6ud5nsww5 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Palo Alto’s GlobalProtect Authentication Bypass Was Exploited Four Days After Disclosure | daily.dev og:description: CVE-2026-0257, a GlobalProtect authentication bypass flaw, was exploited in the wild just four days after public disclosure. The vulnerability stems from a... og:url: https://daily.dev/posts/palo-alto-s-globalprotect-authentication-bypass-was-exploited-four-days-after-disclosure-6ud5nsww5 og:image: https://api.daily.dev/og/posts/6ud5nsWW5.png og:image:alt: Palo Alto’s GlobalProtect Authentication Bypass Was Exploited Four Days After Disclosure og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Palo Alto’s GlobalProtect Authentication Bypass Was Exploited Four Days After Disclosure **[Latest Hacking News](https://daily.dev/sources/lhn)** · 4 min read · 0 upvotes · 0 comments ## Summary CVE-2026-0257, a GlobalProtect authentication bypass flaw, was exploited in the wild just four days after public disclosure. The vulnerability stems from a design flaw in GlobalProtect's authentication override cookie feature: when a shared certificate is used for both cookie encryption and HTTPS, attackers can extract the public key from the TLS handshake and forge a valid session cookie, bypassing credentials entirely. Rapid7 tracked two distinct attack waves in May using Vultr-hosted infrastructure and public PoC tooling with identifiable fingerprints. CISA added the CVE to its Known Exploited Vulnerabilities catalog within two weeks. Fixed PAN-OS versions are available (10.2.7-h34, 11.1.4-h33, 11.2.4-h17, 12.1.4-h6). Workarounds include using a dedicated certificate for override cookies or disabling the feature entirely. Detection guidance includes querying for sessions with empty source_user_info.domain fields and blocking known malicious IPs. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Attackers exploit Palo Alto GlobalProtect flaw days after disclosure](https://daily.dev/posts/attackers-exploit-palo-alto-globalprotect-flaw-days-after-disclosure-7jl7oxcpm) · CSO Online · 0 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/palo-alto-s-globalprotect-authentication-bypass-was-exploited-four-days-after-disclosure-6ud5nsww5) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Palo Alto’s GlobalProtect Authentication Bypass Was Exploited Four Days After Disclosure","url":"https://daily.dev/posts/palo-alto-s-globalprotect-authentication-bypass-was-exploited-four-days-after-disclosure-6ud5nsww5","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/palo-alto-s-globalprotect-authentication-bypass-was-exploited-four-days-after-disclosure-6ud5nsww5"},"datePublished":"2026-06-15T08:20:20.342Z","dateModified":"2026-06-15T08:21:22.345Z","description":"CVE-2026-0257, a GlobalProtect authentication bypass flaw, was exploited in the wild just four days after public disclosure. 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